'\"
'\" Generated from file 'cron\&.man' by tcllib/doctools with format 'nroff'
'\" Copyright (c) 2015 Sean Woods <yoda@etoyoc\&.com>
'\"
.TH "cron" n 0\&.1 tcllib "cron"
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.SH NAME
cron \- Tool for automating the period callback of commands
.SH SYNOPSIS
package require \fBTcl  8\&.5\fR
.sp
package require \fBcron  ?0\&.1?\fR
.sp
\fB::cron::at\fR \fI?processname?\fR \fItimecode\fR \fIcommand\fR
.sp
\fB::cron::cancel\fR \fIprocessname\fR
.sp
\fB::cron::every\fR \fIprocessname\fR \fIfrequency\fR \fIcommand\fR
.sp
\fB::cron::in\fR \fI?processname?\fR \fItimecode\fR \fIcommand\fR
.sp
.BE
.SH DESCRIPTION
.PP
The \fBcron\fR package provides a Pure-tcl set of tools to allow
programs to schedule tasks to occur at regular intervals\&. Rather than
force each task to issue it's own call to the event loop, the cron
system mimics the cron utility in Unix: on task periodically checks to
see if something is to be done, and issues all commands for a given
time step at once\&.
The cron package is intended to work in time scales greater than 1 second\&.
.SH COMMANDS
.TP
\fB::cron::at\fR \fI?processname?\fR \fItimecode\fR \fIcommand\fR
This command registers a \fIcommand\fR to be called at the time specified by \fItimecode\fR\&.
If \fItimecode\fR is expressed as an integer, the timecode is assumed to be in unixtime\&. All
other inputs will be interpreted by \fBclock scan\fR and converted to unix time\&.
This task can be modified by subsequent calls to
this package's commands by referencing \fIprocessname\fR\&. If \fIprocessname\fR exists,
it will be replaced\&.
If \fIprocessname\fR is not given, one is generated and returned by the command\&.
.CS


::cron::at start_coffee {Tomorrow at 9:00am}  {remote::exec::coffeepot power on}
::cron::at shutdown_coffee {Tomorrow at 12:00pm}  {remote::exec::coffeepot power off}

.CE
.TP
\fB::cron::cancel\fR \fIprocessname\fR
This command unregisters the process \fIprocessname\fR and cancels any pending commands\&.
Note: processname can be a process created by either \fB::cron::at\fR or \fB::cron::every\fR\&.
.CS


::cron::cancel check_mail

.CE
.TP
\fB::cron::every\fR \fIprocessname\fR \fIfrequency\fR \fIcommand\fR
This command registers a \fIcommand\fR to be called at the interval of \fIfrequency\fR\&.
\fIfrequency\fR is given in seconds\&. This task can be modified by subsequent calls to
this package's commands by referencing \fIprocessname\fR\&. If \fIprocessname\fR exists,
it will be replaced\&.
.CS


::cron::every check_mail 900  ::imap_client::check_mail
::cron::every backup_db  3600 {::backup_procedure ::mydb}

.CE
.TP
\fB::cron::in\fR \fI?processname?\fR \fItimecode\fR \fIcommand\fR
This command registers a \fIcommand\fR to be called after a delay of time specified by \fItimecode\fR\&.
\fItimecode\fR is expressed as an seconds\&.
This task can be modified by subsequent calls to
this package's commands by referencing \fIprocessname\fR\&. If \fIprocessname\fR exists,
it will be replaced\&.
If \fIprocessname\fR is not given, one is generated and returned by the command\&.
.PP
.PP
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems\&.
Please report such in the category \fIodie\fR of the
\fITcllib Trackers\fR [http://core\&.tcl\&.tk/tcllib/reportlist]\&.
Please also report any ideas for enhancements you may have for either
package and/or documentation\&.
.SH KEYWORDS
cron, odie
.SH CATEGORY
System
.SH COPYRIGHT
.nf
Copyright (c) 2015 Sean Woods <yoda@etoyoc\&.com>

.fi